Taking place at the Nokia Theatre LA Live, the "" star was all smiles as she readied to partake in the night's ceremony - which airs live on ABC starting at 8/7c.

As for the show, numerous top acts are lined up for performances including Justin Bieber, Kelly Clarkson, Carly Rae Jepsen, Christina Aguilera, The Wanted, Ke$ha, No Doubt, Usher, Carrie Underwood, P!nk, Pitbull and Linkin Park, among others.